Addition is a private equity firm and venture capital firm. Based in New York, United States. Known portfolio companies include Anthropic, Stedi, Snyk, Chapter, Airwallex and Frore Systems, 17 companies in all.
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Investment focus
Contacts
Who to pitch at Addition
Addition portfolio companies (17)
- Anthropic
- Stedi
- Snyk
- Chapter
- Airwallex
- Frore Systems
- Chainalysis
- Biologica
- CloudX
- Fauna
- Render
- Xscape Photonics
- Ernesta
- Hello Vet
- Rose Rocket
- Be-A Education
- Nym Health
Co-investors
Funds that share portfolio companies with Addition.
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About Addition
The firm's listing covers sectors AI, Commerce, Education and FinTech, and focus areas Analytics, Biotech, Cloud Infrastructure and Creator Economy; known deals cluster at Growth, Seed and Series A.
The team counts 8 people in our database. Robbie Horwitz (Partner), Aaron Schildkrout (Partner) and Todd Arfman (Partner) are shown as the contacts to pitch.
Across the known portfolio, 20 co-investors appear alongside Addition, including Fidelity Investments, Union Square Ventures and Generation Investment Management.
Frequently asked questions
What is Addition?
Addition is a private equity firm and venture capital firm based in New York, United States, with a known portfolio of 17 companies. The portfolio comes from public investment records rather than from the firm, so deals that never surfaced publicly are not in it.
What does Addition invest in?
Listed sectors include AI, Commerce, Education and FinTech; listed focus areas include Analytics, Biotech, Cloud Infrastructure and Creator Economy. Those tags come from the portfolio attached to the firm, so they describe what has been backed rather than a stated mandate for what comes next.
What stage does Addition invest at?
The known deals of Addition include Growth, Seed and Series A rounds. Check that against your own round before reaching out: stage mismatch is the most common reason a well matched sector still goes nowhere.
Who should I pitch at Addition?
3 of the 8 people on file at Addition are listed as contacts for the firm. All 8 have their own profile page.
How do I contact Addition?
Any email address on file for the firm is masked on this page and readable inside RaiseHunt after you create an account. The 8 people attached to the firm have their own pages, each showing whether an address is on file for them.
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Data: RaiseHunt investor dataset · Snapshot 5 September 2026 · How this data is built · Report a correction or request removal